<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;

        }
    </style>
</head>
<body>
    <div></div>
    <script>
function getRandomColor() {
    if(flag=true){
        let str ='#'
        let arr = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
        for(let i=0;i<6;i++){
            let random = Math.floor(Math.random()*arr.length)
            str += arr[random]
        }
        return str
    }else{
        let r=math.floor(Math.random()*256)
        let g=math.floor(Math.random()*256)
return `rgb(${r},${g},${b})`
return `rgb({r},{g},{b})`
        
    }
}
    console.log(getRandomColor(false))
    console.log(getRandomColor(true))
console.log(getRandomColor())
const div=document.querySelector('div')
div.style.backgroundColor=getRandomColor()
    </script>


</body>
</html>